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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08776049d3e5f0b30985012dba839c1d06a8ccb37bccb7257be8adc8b7f3fc39' 
  AND token = '1QthSeYNxA6XEjvaviJ1U6DXBDF7g7nZICt6rT/wLYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}